Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbce7e83835d39c…

MALICIOUS

PDF

74.7 KB Created: 2021-07-22 09:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6c6cd19c31b9aecd7bdb079bb1500f3 SHA-1: 3b383bd0962123c636a12f2353035f3f228338e9 SHA-256: 8fbce7e83835d39c33d2d31e9e314328c75d8f69297a2edde16bdf0fc19431b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://domeinbeverdonk.be/assets/files/file/74452524536.pdf In PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b3a8e48dfd570fbec204214952765976/kofuxirivuj.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099d7bdb46ad---guzetixal.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/015482b6e568e2aba4661470cafbe13f/97216162360.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vt0c19fhaa7bfv1n9hctfpskol/47856400019.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/27613898087.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/44594124415.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/begotusidumoniv.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/09272a3095d622334e7f91ea6bf02901/34151820444.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/jokitosegolefojem.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097b3eec79fc---sugiwudirafu.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/64513188115.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/64736572624.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/nulatututuwedasusenabon.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3ad31a9a---siruz.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/f3118230868bd9d9453e417dc903b395/xifopegujuwuxofevu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e75f398dd0---lunikuwesumenasunufo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5757482f1---38722252395.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd441ca661---94695049046.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210523032343.pdfIn PDF document text
    • https://goodline.by/userfiles/file/xalinawejuzipavenomotafad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=partial+fraction+expansion+of+repeated+roots+by+differentiationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 10968 bytes
SHA-256: efeecc0011b08488bd1f1b118f063e449f4c6e9884a76dc8ab8e31ac53baea6d
font_01_sfnt_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 15584 bytes
SHA-256: b2b403d57c39982d1f63dd1970f4f8e9f7138fe880ba227bcb6e490750d1a624
font_02_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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